Rotatory feed for rock-drills



(NoModeL) E. E. QUIMBY.

ROTATORY FEED FOR ROCK DRILLS.

No. 312,383; Patented Feb. 17, 1885.

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STATES rnN'r EDI/VARD E. QUIMBY, OF ORANGE, NE\V JERSEY, ASSIGNOE TO THE BAND DRILL COMPANY, OF NEW YORK.

ROTATORY FEED FOR ROCK-DRILLS.

SPECIFICATION forming part of Letters Patent No. 312,383, dated February 17,1885.

Application filed May :2, 1834. (No mozlcl.)

T all whom it may concern:

Be it known that I, EDWARD E. QUIMBY, of Orange, New Jersey, have invented a certain Improvement in Rocking Stops for Governing the Rotatory Feed of the Piston in Rock-Drills and other Analogous Engines, of which the following is a specification.

This invention relates to a modification of the invention shown and described in the pend- IO ing application of Joseph 0. Githens, serially numbered 118,180, the object of which is to vary the extent of the rotatory feed of the piston in a steam rock-drill or other analogous engine, after different working-strokes of the piston, proportionately to any variation which may have existed in the lengths ofsuch working-strokes, respectively, The invention consists of rocking stops, which by means of springs are kept in contact with the head of the spiral bar, and with the wall ofthe chamber in the head of the steam-cylinder in which the head of the spiral bar is contained. The conditions precedent to the operation of such stops are that they shall be free to move in one direction in obedience to the motion imparted to them by the rotation of the spiral bar during the working stroke of the piston, and shall jam between the wall of the chamber in the head of the steam-cylinder and the head of the spiral bar whenever there is any tendency of the spiral bar to turn in the opposite direction, as there is during the return-stroke of the piston.

1n the structure shown and described in the application of Joseph G. Githens above referred to the stops are cylindrical rollers which are contained in recesses varying in width, and are pressed toward the narrower parts of those recesses by springs which yield 40 when the spiralbar rotates in such adirection as to tend to move the rollers toward the wider parts of the recesses in which they are contained. In the present case. instead of employing cylindrical rollers deposited in re- 5 cesses the opposed walls of which are not parallel, the invention consists in employing eccentric stops, each of which at one of its ends is concentrically rounded and seated in a semicircular recess formed either in the periphery of the head of the spiral bar or in the inner wall of the chamber in which the head of the spiral bar is contained, the opposite end of each stop being eccentric with relation to the axis upon which the stop rocks.

As the construction ofrock-drills and analogous engines in which the rotatory feed is imparted to the piston, and hence to the tool attached to the piston by means of a spiral bar such as herein referred to, is well understood, it is not deemed necessary to describe 6: such construction in detail, and therefore the accompanying drawing simply represents an end view of the cylinder-head of a rock-drill with the cap removed, showing the head of the spiral bar contained in the usual chamber formed within the cylinder-head.

The drawing represents the head A of a rock-drill provided with the usual laterallyprojecting ears, one of which, a, is perforated to admit the screw by which the longitudinal 7'0 feed is given to the drill-cylinder, and the other two of which, a a, are perforated to admit the two bolts by means of which the heads are fastened to the body of the cylinder. The usual chamber, A, is provided in the head to contain the head B of the spiral bar B. The head B is provided with four roundbottomed notches, b, in which are deposited the eccentric rocking stops 0, respectively. The bottoms of the notches 1) form the hearings in which the stops 0 rock. The outer ends, 0, of the rocking stops are, as will be seen, eecentric with relation to the axis upon which the stops respectively rock. Each stop 0 is acted upon by an expanding spiral spring, D, one end of which is deposited in a recess formed in one of the side walls of the notch b in the head B of the spiral bar, the opposite end of the spring D entering a shallower recess formed in the side of the stop 0, as shown. 0 In this class ofstructures the spiral bar loosely engages a nut formed in or affixed to a longitudinally recessed piston, and during the working-stroke of the piston the action of this nut upon the spiral bar tends to rotate it in' 5 the direction indicated by the arrow E. R0- tation in this direction tends to rock the stops 0 toward the wall of the notch containing the spring D, which yields and permits the stops 0 to release their frictional hold upon the head B. During the return-stroke the nut in the piston tends to turn the spiral bar in a direction opposite to that indicated by the arrow E. The rotation of the springbar in this direction is prevented by the jamming of the rocking stops 0 between their hearings in the bottoms of the notches B and the side wall of the chamber in the cylinder-head in which the head of the spiral bar is contained. The outer end, 0, of each of the rocking stops 0 is of such eccentricity or inclination that the length of the radius extending from the axis upon which the stop rocks and the outer corner of the stop upon the side on which the spring acts is longer than the radius extending to the opposite outer corner of the rolling stop.

It will of course be seen that instead of notching the head 13 of the spiral bar the wall of the chamber in which the head of the spiral bar is contained may be notched to receive the stops 0, the notches in this case having round bottoms, and the eccentric ends of the rocking stops being presented toward and engaging the periphery of the head B of the spiral bar. In such case the ends of the rocking stops engaging the periphery of the head B would re quire to have a slightly concave surface which would be eccentric with relation to the periphery of the head B and to the axis of the stop.

In the drawing it will be seen that the eccentric ends Got the rocking stops are slightly feed of the pistons of rock-drills or other analogous engines, the combination of the head ofthe spiral bar and the wall of the chamber in the head of the steam-cylinder in which the head of the spiral bar is contained with rocking stops which at one end are seated in bearings serving to fix the axes upon which the stops respectively rock, such bearings being formed by notching the periphery of the head of the spiral bar, and the free ends of the rocki-ng stops being eccentric with relation to the axes upon which they rock, and to the curved surface upon which they are intended to bear, and each stop being provided with a spring, substantially such as described, by the action of which the rocking stop is maintained at one end in constant contact with the round-bottomed notch which constitutes the journal in which the stop rocks, and at the other end with thecurved surface upon which the eccentric end of the stop is intended to bear.

EDVV. E. QUIMBY. Vitnesses:

M. L. ADAMS, R. C. Howns. 

